Iodine has an orthorhombic unit cell for which the a, b, and c lattice parameters are 0.479, 0.725, and 0.978 nm, respectively. (a) If the atomic packing factor and atomic radius are 0.547 and 0.177 nm, respectively, de- termine the number of atoms in each unit cell. (b) The atomic weight of iodine is 126.91 g/mol; compute its theoretical density.

BCC Crystal Structure 1. Proof that for a Body-Centered-Cube Crystal Structure (BCC): 4 R a = V3 Where, "a" is the cube edge length. "R" is atomic radius. 2. Compute the volume of a BCC unit cell (Vc) in terms of the Atomic radius R. 3. Proof that the BCC crystal structure atomic packing factor is equivalent to 0.68

14. In an ideal hexagonal closed packed system, if the atomic radius of the atom was 0.112 nm, write down the three digit value of the lattice parameter cin nm unit Enter your answer

Consider a unit cell with lattice dimensions a, b, and c in the x-, y and z directions. Which of the following sets of Miller indices can represent a crystallographic plane with intercepts of b and (c/4) along the y- and z-axes respectively? (more than one answer is possible for this question. marks will only be awarded for the question if all the correct options are selected (i.e. 'all or nothing' marking scheme). a. b. C. d. (214) (421) (114) e. (412)

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What is the coordination number for atoms in the HCP structure? How does this compare to the coordination number for FCC? How would you expect HCP and FCC to compare in terms of APF? Which would be greater? (or would they be the same?)

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Consider two hypothetical metallic crystal structures A and B. A has a simple cubic and B a fcc lattice structure. Both have the same unit cell volume. The Atomic Packing Factor for A is 0.520 and that for B is 0.740. What is the ratio of the fcc to simple cubic atomic radii?

Please help in both Qs will provide surely good ratings for both solution. Thank u

Calculate the LPF for [101] in a FCC crystal.